Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0228cd5b2527f6d…

MALICIOUS

PDF

86.9 KB Created: 2021-09-07 07:00:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: dd05038293de27c24e956759a46cd6a6 SHA-1: f51e977140e37406da6e2a5c0b0c38b83bb7a1f2 SHA-256: d0228cd5b2527f6d6030b5122fb7ccc193f12c14118b610a89622ec65164bb7c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://smidgel.ru/uplcv?utm_term=esteriliza%C3%A7%C3%A3o+de+materiais+hospitalares+pdf PDF link annotation
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bce4b748ef2---91755450596.pdfIn PDF document text
    • https://emmaushuis.org/pages/7474476300.pdfIn PDF document text
    • http://sirinthepgroup.com/userfiles/file/kelifimodemalafajitixane.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///nejusoxugidilu.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/tpr1du4v64onmfv7qfrbhpqeb4/66418996975.pdfIn PDF document text
    • http://ruresept.ru/files/file/9324976043.pdfIn PDF document text
    • http://guerrazzi.info/userfiles/files/neniwoxivujupuxasobososa.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/ale2bhnodra6m2j0mcave6jlb4/kaxuzamuzifixolex.pdfIn PDF document text
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/ruliz.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/0196486761a1b3edcf4ae68fdbee454a/27986785308.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/purose.pdfIn PDF document text
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/46228696670.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccf75d8bc0c---sibozazijutewonuxi.pdfIn PDF document text
    • https://oxfordjsr.com/userfiles/file/tovilazep.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ced0fa717d0---24772673411.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/b5b67f629834e2ba49c52aa488d0a934/nililafigedof.pdfIn PDF document text
    • http://scoutpate.com/userfiles/file/woxegadagamukixuf.pdfIn PDF document text
    • http://nccutrackandfieldnation.com/clients/2/2c/2cea5a7e730406ee40dfbbde6098010c/File/93303356205.pdfIn PDF document text
    • https://narimasu-chintai.net/jcfiles/file/sizuwaneseva.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/gipixobovufavuje.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16080839a3b6aa---vukiridibaloniwejufe.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/21211125801.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/10396786465.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE568 11164 bytes
SHA-256: 35a94aea571d4a66a4de32065241027661cdc8531c1bef467b2025b5a3cca0c9
font_01_sfnt_off0000ff14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF14 21108 bytes
SHA-256: 86512fb32ab07653ecc94d971c40beb5afd1cc1224a1f02ae76b045403c296f5
font_02_sfnt_off00013364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13364 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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